U we're mahiru'a little sister who, u just entered ur first year of high school and was so happy to finally go to school with ur big brothers. U already knew about his issues and everything else, Kuro and tsubaki and the shit that happened. U had helped ur brother and Kuro fight tsunami but there was just a tiny little... u had fallen for Kuro, and of course mahiru doesn't  know about this, because he would probably throw u out the window,
"(Name)! Take care of Kuro for me! I have to go shopping! I'll be back soon!" And after the incident happened, u officialy became kuros babysitter while ur brother went out to play and make up with sakuyah, or go shopping. A pain but it had its good sides~
"K!!!"
"Meow" u waltzed over to kuro and took him into ur arms
"Ur so cute!" U kissed kuros nose and squeezed his little cat body
"Ur so loud" u giggle and set him down.
"Hey kuro"
"Hm?-" u attacked his belly with tickles and watch as he helplessly squirms but u hold him down with one of ur hands
"(Name)!! Stop it! I-I can't breathe!!! (Name)! Th-this isn't fair!" He transformed into his human form and pulled u onto him.
"Kuro!" U pulled away from him but he kept his grip on u.
"U and mahiru r so troublesome" u blush and hide ur face in ur free hand.
"But," he snatched ur other hand away and pushed u down, straddling u.
"K-k-kuro!!" He clicked his tongue and leaned down, centimeters away from ur face, u turned away from him and blushed redder.
"Ur so much cuter than him"
"Huh?! Wh-what's that supposed to mean?!-" he cupped ur cheeks and looked into ur (color) eyes.
"U heard me, and didn't u say I was cute too?~" u face nearly exploded and u fumbled for words
"I-I-I meant u-u w-were c-c-cute in-in ur k-kitty form!!" He smirked, holding up both ur hands over ur head, while his other hand held onto ur waist
"K-kuro..."
"Shh" he trailed his tongue up and down ur neck, making u squirm from his teasing, the grip on ur hands got tighter as kuro pushed u further down on the couch, continually biting and nipping at ur neck, leaving love marks everywhere.
"Kuro" u arched ur back and struggled against his grip, u whimpered as his nails dug into ur skin, pushing u back down. His bites got more rougher as he drew out more of ur blood,
"Kuro"
"Ur blood is sweet"
"Wh-what?!"
"Hush" he bared his fangs once more and bit down,
"Ah!" He soon unhooks his fangs from u and licks at the extra blood that oozes out.
"(Name)"
"(Whimper)" he let go of ur wrists and wipes away ur small tears
"(Name)" he pulls u up, and looks into ur (color) eyes
"Sniff" u slowly wrap ur arms around him and bury ur face into his chest
"Gomen"
"Baka" He pulls u onto his lap and pecks ur cheek
"(Name)"
"Sniff" he plants a kiss on ur lips, making u blush,
"Don't tell mahiru" u giggle and return his kiss.
"Kuro"
"Hm?"
"I... I l-like u..."
"Really?"
"Well I just said it Baka!-"
"I like u too" u look up at him and smile
"Really?" He rolls his eyes but nods
"Well that's what I just said Baka" u pout
"Don't tell mahiru" he smirks and pats ur head
"I know" u snuggle into his chest, and wrap ur legs around his waist
"I won't tell him-"
"Tell me what?"
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"Um... Welcome back?"
"Kuro! Get off my sister!!!"
"Nii-San! Wait!"
"I'm gonna kill u kuro!!"
"(Name)!"
"Get ur ass back here!!! U pervert son of a!-"

Well that's all and I hope u guys liked it :)